Look at that bit of a crag split like a bishop's mitre." "Yes: I see." "We've got to get this laid-down rock in a line with it, and there are our bearings; we can't be wrong then." "No," cried Mike.

"Who wouldn't know how to take his bearings when he's out, and wants to mark a spot! Now then, is it lay our heads for home ?" It was a long while before either of them slept that night for thinking of their discovery, and when they did drop off, the dark, tunnel-like place was reproduced in their dreams..